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Method and apparatus to detect and correct motion in list-ode pet data with a gated signal

A mode and data technology, applied in image data processing, projection reproduction, 2D image generation, etc., can solve problems such as image noise

Active Publication Date: 2013-09-04
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The resulting image will be noisy, making it difficult or impossible to identify small lesions

Method used

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  • Method and apparatus to detect and correct motion in list-ode pet data with a gated signal
  • Method and apparatus to detect and correct motion in list-ode pet data with a gated signal

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Embodiment Construction

[0020] refer to figure 1 , an anatomical scanner such as CT scanner 10 generates CT data from which CT reconstruction processor 12 reconstructs a 3D anatomical image of a reference motion phase or a series of anatomical images of a series of reference motion phases from the CT data. The reference images are stored in memory or cache 14 and converted into attenuation maps which are stored in attenuation map memory or cache 16 for use during reconstruction of PET or other functional images.

[0021] A functional imaging system, such as a PET imaging system, includes a gantry in which a region of interest of a subject is positioned. In PET and other nuclear medicine systems, a radiopharmaceutical tracer is injected into a subject. The PET gantry system detects a series of detected radiation events that define the endpoints of a series of lines of response (LORs). The clock 22 time-stamps detection events with an associated detection time. Coincidence detector 24 detects pairs ...

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Abstract

A PET scanner (20, 22, 24, 26) generates a plurality of time stamped lines of response (LORs). A motion detector (30) detects a motion state, such as motion phase or motion amplitude,of the subject during acquisition of each of the LORs. A sorting module (32) sorts the LORs by motion state and a reconstruction processor (36) reconstructs the LORs into high spatial, low temporal resolution images in the corresponding motion states. A motion estimator module (40) determines a motion transform which transforms the LORs into a common motion state. A reconstruction module (50) reconstructs the motion corrected LORs into a static image or dynamic images, a series of high temporal resolution, high spatial resolution images.

Description

technical field [0001] This application relates to the field of diagnostic imaging. The present invention finds particular application in use in connection with positron emission tomography (PET) systems collecting data in tabular mode and will be described with particular reference thereto. However, it is to be appreciated that the following may also apply to other types of nuclear imaging, combined nuclear / CT imaging, CT imaging, etc. Background technique [0002] In PET imaging, each radioactive decay event results in a pair of diametrically opposed gamma rays that are detected simultaneously, defining a line of response (LOR). The LOR is collected over a period of time - typically significantly longer than a breathing or cardiac cycle - and reconstructed into a 3D image. When imaging the lungs, heart, or the area around them, body tissue undergoing radioactive decay due to respiration or heart motion is periodically displaced in space, resulting in blurring (or loss of...

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Application Information

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IPC IPC(8): G06T11/00
CPCG06T11/005G06T2211/412G06T11/003
Inventor P·奥利维尔A·珀金斯B·张C-H·通
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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